Optical rectifier for cinematographic apparatus



Feb. 26, 1924; 1,485,195

0. MESSTER OPTICAL RECTIFIER FOR CINEMATOGRAPHIC APPARATUS Filed April 28, 1921 INVENTOR, KMMM" L fia- Patented Feb. 26, 19 24.

' UNITED STATES OSKAR MESSTER, F BERLIN, GERMANY.

OPTICAL RECTIFIER FOR CINEMATOGRAPHIC APPARATUS.

Application filed April 28, 1921. Serial No. 465,274. I

- cal compensating means, and is an improvement in the invention described and claimed in the specification of my Patent Number 1,432,405.

ln accordance with the present invention means are provided whereby the method of compensation, described in the specification of the pending application aforesaid, for obviating a disturbing parallax when projecting the pictures, is also adapted for use in taking the pictures.

To the attainment of this end the optical system for conducting the pictures alternately to the one and to the other compensating means, comprises mirror-segments arranged parallel to one another in front of, and inclined to, the objective and adapted to be moved alternately intothe raypath through the latter, and deflecting mirrors arranged for oscillation before and behind said mirror-segments. I

The invention is illustrated, by way of example, on the annexed drawing, whereon, as in the parent application aforesaid, a is i the lamp-box, b the guide channel for the objective,

film d, m the rotary shutter, and g the objective. c

Under the present invention two rotatable mirror-segments h,h are arranged parallel to each other in front of, and inclined to the and two oscillatory mirrors 2,7? are provided in conjunction therewith of which i is arranged before the mirror-segment h and z behind the mirror segment h. In operation, the mirror segments h,h are rotated at uniform speed and so that first one and then the other is moved into the ray-path through the objective g, then when using the apparatus as a projector, first a picture is projected from the objective p to the rotating mirror hthence to the 0501 lating mirror i, (the mirror-segment h being clear of the latter at this moment) and finally to the screen; the next picture is projected from the objective 9 to the oscillating mirror 7?, (the mirror-segment it being clear of the latter at this moment) thence to the rotating mirror it, and finally to the screen, the direction of this projection from the mirror in being the same as that of the preceding projection from the tilting mirror 2'.

When taking pictures by means of the apparatus, the rays arriving from the object taken pass to the film alternately in the directioni h g and 79,2,

It will be apparent therefore, that the same arrangement m'ay be employed for projecting'pictures, as well as for taking them, without the operation being affected by a disturbing parallax.

Any suitable me'ans may be employed for rotating the mirror segments h,h and for simultaneously oscillating the deflecting mirrors in. In the example illustrated the shaft m which carries the shutter m, is provided with three bevel wheels m m and m The wheel or meshes with a wheels r0- tatable with the sprocket wheel e for the film band 0?. The bevel wheels m and m respectively engage bevel wheels n and 0 on the shafts n,0 of the mirror segmentsiah. The shafts 12,0 have cams or tappets u,t against which bear arms a 2 attached to thedeflecting mirrors 2', i. The bevel wheels n 0 are twice the sizeof the bevel wheels m m sothat the shutter m makes two revolutions for every revolution of the mirror segments h,h

- It will be apparent is driven the parts e,m,h and b of the system 'are positively rotated whilst the deflecting mirrors 5,11 are simultaneously osolllat'ed with the resultalready mentioned.

Having fully described my invention what I claim and desire to secure by Letters Patent is 1. The combination with cinematographic apparatus adapted for operation with a continuously running film-band, of optical compensating means, comprising two paral' lel mirrors inclined with respect to the optical axis of the objective of the apparatus and movable alternately into the ray-path through said objective, and two deflecting mirrors arranged for oscillation onopposite that when the shaft m v sides with respect to the first-mentioned Y mirrors.

2. The combination with cinematographic apparatus adapted for operation with a. continuously running film-band, of two parallel mirrors, of which the one .is movable intermittently in front of the objective of the apparatus and the other is movable synchronously with the first, two deflecting mirrors of which the one is arranged to reflect the rays reflected by the first-mentioned mirrors, and the other is arranged to reflect the rays reflected by the second mentioned mirror, and means for oscillating said deflecting mirrors.

3. The combination with cinematographic apparatus adapted for operation with a continuously running film-band, of two rotatable mirror-segments arranged parallelly with respect to one another but inclined with respect to the axis of the objective of the apparatus and movable alternately into the ray-path through said objective, and two oscillatory deflecting mirrors, arranged one in the objective-axis and the other laterally from it, the deflecting mirrors co-operating alternately with said inclined mirrors to deflect the rays.

a. The combination withcinematographic apparatus adapted for operation with a continuously running film-band, or" two rotatable mirror-segments, arranged parallelly with respect to one another, but inclined with respect to the axis of said objective and being adapted to alternately reflect the rays, and two oscillatory deflecting mirrors, of which the one is located in the objective-axis and the other is arranged laterally from it, the planes of the first-mentioned two mirrors lying between the planes of said other two mirrors and each of these latter being adapted to cooperate with the rotatable mirror lying laterally from it.

In testimony whereof I aflix my signature in presence of two witnesses.

c OSKAR MESSTER.

Witnesses:

EMIL HEIN, A. PQHL. 

